Date: Wed, 17 Nov 2010 15:08:35

Author: Paul Nord

Subject: Re: Sorry, I have to unsubscribe. Need your help.

Post:

Mizuho,

Sorry to hear that UMN provides such poor email service.

I've been expecting to see universities eliminating IT staff and servers and just telling everyone to sign up for a free gmail account. Or, better yet, cut the IT budget entirely and pay google $50/person/year to provide the services. I'm not sure if it's a loss, really. Perhaps it's just a sign that the technology has matured to the point where we don't need local staff to manage it anymore.

If you'd like to stick around, get yourself a gmail account and subscribe from there.

Paul


On Nov 17, 2010, at 2:31 PM, schwa672@umn.edu wrote:

> Hello,
>
> My e-mail server asked me to unsubscribe Tap-L to save disk space. I requested twice to mj2@lists.ncsu.edu with message "unsubscribe" but nothing happened.
>
> Our e-mail administrator warned me if I do not/cannot unsubscribe they are going to block any e-mail from Tap-L. I enjoy reading the Tap-L discussions and I am careful. Usually I delete the messages after I read them but still our system appears to be over loaded. Would you help me removing my name (schwa672@umn.edu) from Tap-L mail list?
>
> I will check the Tap-L discussions on archive site from now on.
>
> Thanks,
>
> Mizuho Schwalm
> wants to On Nov 17 2010, Keith Warren wrote:
>
> I second Jerry here. Based on his recommendation we purchased the same supply earlier this year. We then mounted a .33 ohm, 40A current limiting resistor to the supply housing. The resistor cost about $70 from Post Glover. The setup works great.
>>
>>
>> -Keith
>>
>> NCSU
>>
>>
> From: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Zani, Gerald
>> Sent: Wednesday, November 17, 2010 8:41 AM
>> To: tap-l
>> Subject: Re: [tap-l] 20A DC power supply ideas
>>
>>
> I use a wonderful 35 Amp! low voltage variable 0 - 14 VDC power supply designed for mobile Ham Radio hobby use from MFJ Enterprises.
>>
> If I remember correctly I originally paid about ~$130 for it about ~12 years ago so time has proven that it works well.
>>
>>
>> It is the MFJ model 4035MV:
>>
>>
>> http://www.mfjenterprises.com/Product.php?productid=MFJ-4035MV
>>
>>
>> MFJ Enterprises
>>
>> Starkville, LA 39759
>>
>> http://www.mfjenterprises.com/
>>
> I bought a 1/4 Ohm, ~1000 Watt resistor to serve as a series ballast. When I have a short circuit load I use the ballast resistor so the power supply can handle a continuous short circuit load without tripping the internal crowbar protection circuit. Been using it for 12 years to create magnetic fields for various wire lengths and geometries. Because it is variable from 0 - 14 VDC I can adjust the current as desired to maximize the magnetic field strength but prevent it from over heating the wire.
>>
>>
>> - JZ
>>
>>
>> 2010/11/17 Simcha Segev
>>
>> Chuck and all,
>>
> Car battery chargers may supply up to 20A but usually the DC is with a great
>> ripple. As the current is higher, the ripple and noise are huge and this
>> become more AC then DC.
>>
>> Bill, the HP 6264B costs 10 times more then you wrote i.e 1200$ and up. If
>> you have a better price proposal, please inform us.
>>
>> Thanks, Simcha
>>
>>
>>
>> Simcha Segev
>> Physics Demonstration Lab
>> School of Physics and Astronomy
>> Tel Aviv University, Ramat aviv, Israel
>> Tel. 972-3-6408077 Fax. 972-3-6429306
>> E-mail: simcha@post.tau.ac.il
>> Web site : http://www.tau.ac.il/~simcha
>>
>>
>>
>>
>>
>>
>> -----הודעה מקורית-----
> מאת: tap-l-owner@lists.ncsu.edu [mailto:tap-l-owner@lists.ncsu.edu] בשם
>> chuck britton
>> שלח: ד 17 ובמבר 2010 00:24
>> אל: tap-l@lists.ncsu.edu
>> ושא: Re: [tap-l] 20A DC power supply ideas
>>
>> Car battery chargers work fine.
>> Rugged and inexpensive.
>>
>>
>> At 11:58 AM -0800 11/16/10, John Welch wrote:
>>> Hey all - I'm looking for recommendations for a relatively cheap way
>>> to get a 20A DC power supply. I don't really care about the voltage
>>> rating, since I'll just be shorting it most of the time to create
>>> magnetic fields around wires. So it has to be something that is
>>> regulated enough that it can be shorted without blowing fuses. It
>>> doesn't have to be 20A exactly, but in that ball park. Do car
>>> battery charges work for this?
>>
>>
>>
>>
>>
>



From tap-l-owner@lists.ncsu.edu Wed Nov 17 16:51:29 2010
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